I recently returned my Specialized Speed Zone Pro (wireless speedo, wired cadence) because I was not getting good mph readings and the cadence was also erratic. I may have had sight-line problems with the speedo function - unit was mounted on aerobars above profile design water jug also located between bars - but after two trips back to the lbs for corrective action it still would not function properly. Are there any "dependable " (don't laugh) wireless units out there ? I may have to go back to wired but before I do I wanted to check in with the forum. Early reports I've heard on the Mavic Wintech lead me to believe that it's not what I'm looking for.